package com.jsy.util;

public class PageUtil {

        /**
         * 生成分页代码
         * @param targetUrl 目标地址
         * @param totalNum 总记录数
         * @param currentPage  当前页
         * @param pageSize 每页大小
         * @return
         */
        public static String genPagination(String targetUrl,long totalNum,int currentPage,int pageSize,String param){
            long totalPage=totalNum%pageSize==0?totalNum/pageSize:totalNum/pageSize+1;
            if(totalPage==0){
                return "未查询到数据";
            }else{
                StringBuffer pageCode=new StringBuffer();
                pageCode.append("<li><a href='"+targetUrl+"?page=1&"+param+"'>首页</a></li>");
                if(currentPage>1){
                    pageCode.append("<li><a href='"+targetUrl+"?page="+(currentPage-1)+"&"+param+"'>上一页</a></li>");
                }else{
                    pageCode.append("<li class='disabled'><a href='"+targetUrl+"?page=1&"+param+"'>上一页</li>");
                }
                for(int i=currentPage-2;i<=currentPage+2;i++){
                    if(i<1||i>totalPage){
                        continue;
                    }
                    if(i==currentPage){
                        pageCode.append("<li class='active'><a href='"+targetUrl+"?page="+i+"&"+param+"'>"+i+"</a></li>");
                    }else{
                        pageCode.append("<li><a href='"+targetUrl+"?page="+i+"&"+param+"'>"+i+"</a></li>");
                    }
                }
                if(currentPage<totalPage){
                    pageCode.append("<li><a href='"+targetUrl+"?page="+(currentPage+1)+"&"+param+"'>下一页</a></li>");
                }else{
                    pageCode.append("<li class='disabled'><a href='"+targetUrl+"?page="+totalPage+"&"+param+"'>下一页</li>");
                }
                pageCode.append("<li><a href='"+targetUrl+"?page="+totalPage+"&"+param+"'>尾页</a></li>");
                return pageCode.toString();
            }
        }

}
